Fundamentals of Electricity Practice Questions with Solutions – Electrical Engineering (Page 7)

#121📘 EE Pocket Reviewer RojasEasy

The electrical conductivity in liquid solutions depends on which of the following?

ANeutrons

BIons

CProtons

DMolecules

#122📘 EE Pocket Reviewer RojasEasy

Which of the following is used to measure the specific gravity of the electrolyte in a battery?

AHydrometer

BManometer

CMechanical gauge

DPsychrometer

#123📘 EE Pocket Reviewer RojasEasy

Which of the following is a primary cell?

ALead-acid cell

BMercury-oxide cell

CNickel-iron-alkaline cell

DNickel-cadmium-alkaline cell

#124📘 EE Pocket Reviewer RojasEasy

What is the purpose of connecting cells in series parallel?

ATo increase the output voltage

BTo increase the current capacity

CBoth A and B

DNone of these, because it never happens

#125📘 EE Pocket Reviewer RojasEasy

Which one is the usual usage of the Weston cell?

AA voltage reference source

BA power reference source

CA current reference source

DA fuel cell

#126📘 EE Pocket Reviewer RojasEasy

While charging a battery, which one should be strictly followed?

AKeep it in a well-ventilated room

BCheck the acid level with a lighted match sticks

CShort circuit the terminals of the battery to see if its already fully charge

DConnect and disconnect the battery from time to time to rest the supply

#127📘 EE Pocket Reviewer RojasEasy

The ampere-hour capacity of an industrial battery is based on how many hours of discharged?

A12 hours

B8 hours

C24 hours

D6 hours

#128📘 EE Pocket Reviewer RojasEasy

Which one is an active material of a nickel-iron battery?

ANickel hydroxide

BPowdered iron and its oxide

C21% solution of caustic potash (KOH)

DAll of these

#129📘 EE Pocket Reviewer RojasEasy

A dead storage battery can be revived by ____.

AA dose of \(H_2SO_4\)

BAdding so-called battery restorer

CAdding distilled water

DNone of these (it cannot be revived)

#130📘 EE Pocket Reviewer RojasEasy

Which of the following is the best reason why nickel-cadmium cell is commonly used as power supplies to electronic calculators?

AIt is rechargeable

BIt is a dry type cell

CIt is easily manufactured

DIt has a standard shape

#131📘 EE Pocket Reviewer RojasEasy

The output voltage of a lead-acid cells ____.

A1.25 V

B1.35 V

C2.1 V

D6 V

#132📘 EE Pocket Reviewer RojasEasy

What happens if a lead-acid battery was left discharged for a longer time?

AIts acid will evaporate

BIts electrolyte will become more weak

CThe electrolyte will eat up the container

DThe plates will become sulphated

#133📘 EE Pocket Reviewer RojasEasy

For the process of electrolysis, what supply voltage is required?

Adc supply

Bac supply

CDc or ac supply but it should be varying

DDc or ac supply as long as it is constant

#134📘 EE Pocket Reviewer RojasEasy

Which one is an active material of a lead-acid cell?

ALead peroxide

BSponge lead

CDilute sulphuric acid

DAll of these

#135📘 EE Pocket Reviewer RojasEasy

Which of the following is considered a major drawback of a primary cell?

AChemical action is not reversible

BChemical action is reversible

CThe electrolyte used is expensive

DIt is not portable

#136📘 EE Pocket Reviewer RojasEasy

The best indication about the state of charge on a lead-acid battery is given by

AOutput voltage

BColor of electrolyte

CTemperature of electrolyte

DSpecific gravity of electrolyte

#137📘 EE Pocket Reviewer RojasEasy

In which of the following devices would a transistor battery be the best power choice?

AAn electronic calculator

BAn LCD wall clock

CA two-way portable radio

DA heart pacemaker

#138📘 EE Pocket Reviewer RojasEasy

Battery charging equipment is usually installed where?

AIn a well ventilated location

BIn a clean and dry places

CAs near as practical to the battery being charged

DAll of these

#139📘 EE Pocket Reviewer RojasEasy

A lead-acid cell is being charged. When the specific gravity of the electrolyte is about 1.25, the cell is ____ percent charged.

AAbout 75%

BAbout 25%

C100%

DAbout 50%

#140📘 EE Pocket Reviewer RojasEasy

Which of the following will work only on dc supply?

AElectric lamp

BHeater

CRefrigerator

DElectroplating

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